Pump cleaning and inspection a. The overall factory centrifugal pump in rust-proof period, its internal parts should not be removed, only the appearance of cleaning. When more than rust warranty period or obvious defects to be disassembled, the disassembly, cleaning and inspection shall comply with the provisions of the technical documents of the equipment. When there is no regulation, the following requirements shall be met: the impeller components should be cleaned and the impeller should be removed without damage; the cooling water pipeline should be clean and clean and should be kept clear; the pipeline pump and the coaxial pump should not be disassembled.
b. Disassembly factory pump cleaning and inspection should meet the following requirements: Centrifugal pump main parts, components and ancillary equipment, the middle part and the package parts, parts of the end surface shall not be scratched and scratched, the surface of the shaft shall not be cracked, the pressure Injury and other defects, should be removed after cleaning clean water and parts, components and equipment should be coated with lubricating oil and the classification according to the order of assembly; vertical split shell pump should not be removed and cleaned.
The overall installation of the vertical pump horizontal installation should not exceed the horizontal deviation of 0.10 / 1000 horizontal installation horizontal deviation should not be greater than 0.20 / 1000, and should import and export of the pump flange or other horizontal surface measurements. Horizontal and vertical displacement of the disassembled pump shall not be greater than 0.05 / 1000 horizontal and shall be measured at the horizontal face, the exposed part of the shaft and the horizontal working face of the base.
Centrifugal pump correction a. Drive shaft and pump shaft, the drive shaft and the transmission shaft coupling to the coupling, the two halves of the radial displacement, clearance, axial tilt should comply with the provisions of equipment technical documents. When there is no regulation, it shall comply with the provisions of "General Rules for Construction and Acceptance of Machinery and Equipment Installation Engineering".
b. When the drive shaft and the pump shaft are connected by a belt, the parallelism of the two shafts and the offset of the two wheels should meet the requirements of "General Specifications for Construction and Acceptance of Mechanical Equipment Installation Engineering".
c. Turbine-driven pumps and pumps that deliver high and low temperature fluids (boiler feed pumps, hot oil pumps, cryogenic pumps, etc.) are calibrated at room temperature and should be compensated for temperature changes as specified in the design.
The installation of high speed pump or large disassembly pump should measure the radial and end runout values ​​of the main parts such as the rotor impeller, sleeve, impeller seal ring, balance disc, journal and so on. The allowable deviation should meet the requirements of equipment and technical documents.
Rotor Assembly The total radial clearance between the rotor assembly and the housing assembly shall comply with the equipment specifications. Impeller in the volute chamber before the axial and rear axial clearance, multi-stage multi-stage pump axial size should be consistent with the provisions of technical documents; multi-stage pump at all levels of the original gasket thickness shall not be changed. High-temperature balancing disk (drum) and the balance between the sleeve axial clearance, single-shell segment pump should be 0.04 ~ 0.08mm, double-shell pump should be 0.35 ~ lmm; Thrust bearing and thrust plate between Total axial clearance, single-shell pump segment should be 0.5 ~ lmm, double-shell pump should be 0.5 ~ 0.7mm.
The centerline of the impeller exit should be aligned with the pump housing runner centerline. Multistage pump balancing plate and balance plate in the case of close, the width of the impeller Vl should be within the guide vane inlet width.
â‘¥ Centrifugal pump bearing plain bearings and bearing pads on the back of the seat should be closely fit, the interference value should be within the range of 0.02 ~ 0.04mm; bearing bushings and side clearance and side clearance should meet the requirements of equipment technical documents.
Rolling bearing and shaft and bearing with the tolerance, the axial clearance between the rolling bearing and the end cap and the media caused by axial expansion of the temperature gap, radial thrust radial bearing and its preload should be equipment Technical documents require inspection and adjustment. When there is no regulation, it should be implemented according to the current national standard "General Specifications for Construction and Acceptance of Machinery and Equipment Installation Engineering".
⑦ assembly packing seal radial total clearance should be consistent with the provisions of equipment and technical documents. When there is no regulation, the requirements of Table 2-2 should be met. After the packing is compressed, the inlet of the packing ring and the liquid sealing pipe should be aligned or the packing ring should be slightly outside.
⑧ Other seals Mechanical seals, floating ring seals, labyrinth seals and other forms of shaft seals of the various parts of the gap and contact requirements shall comply with the provisions of equipment technical documents. When there is no regulation, it shall comply with the provisions of "General Rules for Construction and Acceptance of Machinery and Equipment Installation Engineering".
b. Disassembly factory pump cleaning and inspection should meet the following requirements: Centrifugal pump main parts, components and ancillary equipment, the middle part and the package parts, parts of the end surface shall not be scratched and scratched, the surface of the shaft shall not be cracked, the pressure Injury and other defects, should be removed after cleaning clean water and parts, components and equipment should be coated with lubricating oil and the classification according to the order of assembly; vertical split shell pump should not be removed and cleaned.
The overall installation of the vertical pump horizontal installation should not exceed the horizontal deviation of 0.10 / 1000 horizontal installation horizontal deviation should not be greater than 0.20 / 1000, and should import and export of the pump flange or other horizontal surface measurements. Horizontal and vertical displacement of the disassembled pump shall not be greater than 0.05 / 1000 horizontal and shall be measured at the horizontal face, the exposed part of the shaft and the horizontal working face of the base.
Centrifugal pump correction a. Drive shaft and pump shaft, the drive shaft and the transmission shaft coupling to the coupling, the two halves of the radial displacement, clearance, axial tilt should comply with the provisions of equipment technical documents. When there is no regulation, it shall comply with the provisions of "General Rules for Construction and Acceptance of Machinery and Equipment Installation Engineering".
b. When the drive shaft and the pump shaft are connected by a belt, the parallelism of the two shafts and the offset of the two wheels should meet the requirements of "General Specifications for Construction and Acceptance of Mechanical Equipment Installation Engineering".
c. Turbine-driven pumps and pumps that deliver high and low temperature fluids (boiler feed pumps, hot oil pumps, cryogenic pumps, etc.) are calibrated at room temperature and should be compensated for temperature changes as specified in the design.
The installation of high speed pump or large disassembly pump should measure the radial and end runout values ​​of the main parts such as the rotor impeller, sleeve, impeller seal ring, balance disc, journal and so on. The allowable deviation should meet the requirements of equipment and technical documents.
Rotor Assembly The total radial clearance between the rotor assembly and the housing assembly shall comply with the equipment specifications. Impeller in the volute chamber before the axial and rear axial clearance, multi-stage multi-stage pump axial size should be consistent with the provisions of technical documents; multi-stage pump at all levels of the original gasket thickness shall not be changed. High-temperature balancing disk (drum) and the balance between the sleeve axial clearance, single-shell segment pump should be 0.04 ~ 0.08mm, double-shell pump should be 0.35 ~ lmm; Thrust bearing and thrust plate between Total axial clearance, single-shell pump segment should be 0.5 ~ lmm, double-shell pump should be 0.5 ~ 0.7mm.
The centerline of the impeller exit should be aligned with the pump housing runner centerline. Multistage pump balancing plate and balance plate in the case of close, the width of the impeller Vl should be within the guide vane inlet width.
â‘¥ Centrifugal pump bearing plain bearings and bearing pads on the back of the seat should be closely fit, the interference value should be within the range of 0.02 ~ 0.04mm; bearing bushings and side clearance and side clearance should meet the requirements of equipment technical documents.
Rolling bearing and shaft and bearing with the tolerance, the axial clearance between the rolling bearing and the end cap and the media caused by axial expansion of the temperature gap, radial thrust radial bearing and its preload should be equipment Technical documents require inspection and adjustment. When there is no regulation, it should be implemented according to the current national standard "General Specifications for Construction and Acceptance of Machinery and Equipment Installation Engineering".
⑦ assembly packing seal radial total clearance should be consistent with the provisions of equipment and technical documents. When there is no regulation, the requirements of Table 2-2 should be met. After the packing is compressed, the inlet of the packing ring and the liquid sealing pipe should be aligned or the packing ring should be slightly outside.
⑧ Other seals Mechanical seals, floating ring seals, labyrinth seals and other forms of shaft seals of the various parts of the gap and contact requirements shall comply with the provisions of equipment technical documents. When there is no regulation, it shall comply with the provisions of "General Rules for Construction and Acceptance of Machinery and Equipment Installation Engineering".
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